• LED
  • Beginner
  • 3 min
  • Serial CLI

Recipe · Beginner · LED

How to set one addressable LED pixel by index

Use the LED set command to change a single pixel by index with named, hex or RGB colors.

Addressable LED pixel ring test pattern.
A practical ESP32 Bit Pirate workflow based on the documented firmware commands.
Step 1

Commands

Run the workflow from the CLI after selecting the matching mode.

Result

What it means

The output confirms that the protocol path is working and gives you a baseline for deeper experiments.

Troubleshooting

  • If the wrong LED changes, check the physical data direction.
  • If no LED changes, run config again.
  • Use reset after tests to turn all pixels off.

Next steps

  • Use fill to test the whole strip.
  • Use blink, chase or rainbow after the base wiring is confirmed.
  • Document LED count and direction for the project.

single LED pixel index FAQ

How are LED strip pixels numbered?

Pixels are addressed from the strip data input and use zero-based indexes. The configured strip length defines the highest valid index for set and fill style commands.

What color formats can set use?

Use named colors, hex values such as #FF00FF or 0x00FF00, decimal RGB values, or simple on and off shortcuts where supported.

When should I use set instead of fill?

Use set when you want to identify or test a single pixel index. Use fill when you want a full-strip color test after the strip length and color order are already understood.

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